摘要
为克服纳米粉体光催化剂易团聚、难回收和容易引起二次污染等缺点,采用"一步"水热法在纤维素膜表面原位生长多孔球形微纳米ZnO颗粒。利用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)和热重分析仪(TG)分析了纤维素/ZnO复合膜的微观形貌、组成、晶体结构、热稳定性以及ZnO的负载量;采用紫外-可见分光光度计根据亚甲基蓝溶液的降解测试其光催化活性。结果表明:该方法可成功实现纤维素膜对ZnO颗粒的负载,且当加热时间为12h时,负载的ZnO颗粒数量多分布均匀,且为多孔球状并呈典型的纤锌矿结构。在紫外光照射下,纤维素/ZnO复合膜具有优越的光催化性能,可用于降解染料等有机物;当ZnO负载量为6 mg时,3h内亚甲基蓝的催化效率为90%。
In order to overcome the aggregation and overlap of nanopowder photocatalysts, the cellulose/ZnO composite films with porous spherical ZnO crystals immobilized in cellulose matrix were prepared by an in-situ hydrothermal meth- od. The morphologies, composition and crystal structure of the prepared composite films were characterized by scanning electron microscopy （SEM）, energy dispersive spectrum analysis （EDS） and X-ray diffraction （XRD）. The thermosta- bility of the composite films and content of ZnO particles were calculated by thermogravimetric analysis （TG）. The pho- tocatalytic activities were evaluated by degrading methylene blue and determined by UV-vis spectrophotometer. The re- sults show that the composite films are successfully prepared by this method with ZnO particles distributing uniformly on their surface when heated for 12 h. These ZnO particles are porous spherical and presented typically hexagonal wurtzite structure. Under UV light irradiation, the prepared cellulose/ZnO composite films exhibit excellent photocatalytic activi- ty; the photocatalytic efficiency within 3 h can reach 90% with the amount of ZnO less than 6 mg.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2015年第5期30-36,共7页
China Surface Engineering
基金
国家自然科学基金(51335010)
国家自然科学基金(51475450)
国家重点基础研究发展计划(973计划)(2014CB643302)
浙江省创新团队(2011R50006)
宁波市先进涂层与薄膜材料创新团队(2011B81001)
关键词
“一步”水热法
纤维素
光催化
负载型光催化剂
one-step hydrothermal method
cellulose
photocatalysis
supported photocatalysts
